/*!
 * VisualEditor DataModel MWExtensionNode class.
 *
 * @copyright 2011-2015 VisualEditor Team and others; see AUTHORS.txt
 * @license The MIT License (MIT); see LICENSE.txt
 */

/**
 * DataModel MediaWiki extension node.
 *
 * @class
 * @abstract
 * @extends ve.dm.LeafNode
 * @mixins ve.dm.FocusableNode
 * @mixins ve.dm.GeneratedContentNode
 *
 * @constructor
 */
ve.dm.MWExtensionNode = function VeDmMWExtensionNode() {
	// Parent constructor
	ve.dm.MWExtensionNode.super.apply( this, arguments );

	// Mixin constructors
	ve.dm.GeneratedContentNode.call( this );
	ve.dm.FocusableNode.call( this );
};

/* Inheritance */

OO.inheritClass( ve.dm.MWExtensionNode, ve.dm.LeafNode );
OO.mixinClass( ve.dm.MWExtensionNode, ve.dm.FocusableNode );
OO.mixinClass( ve.dm.MWExtensionNode, ve.dm.GeneratedContentNode );

/* Static members */

ve.dm.MWExtensionNode.static.enableAboutGrouping = true;

ve.dm.MWExtensionNode.static.matchTagNames = null;

ve.dm.MWExtensionNode.static.childNodeTypes = [];

/**
 * HTML tag name.
 * @static
 * @property {string}
 * @inheritable
 */
ve.dm.MWExtensionNode.static.tagName = null;

/**
 * Name of the extension and the parser tag name.
 * @static
 * @property {string}
 * @inheritable
 */
ve.dm.MWExtensionNode.static.extensionName = null;

ve.dm.MWExtensionNode.static.getMatchRdfaTypes = function () {
	return [ 'mw:Extension/' + this.extensionName ];
};

ve.dm.MWExtensionNode.static.toDataElement = function ( domElements, converter ) {
	var dataElement, index,
		mwDataJSON = domElements[ 0 ].getAttribute( 'data-mw' ),
		mwData = mwDataJSON ? JSON.parse( mwDataJSON ) : {};

	dataElement = {
		type: this.name,
		attributes: {
			mw: mwData,
			originalMw: mwDataJSON
		}
	};

	index = this.storeGeneratedContents( dataElement, domElements, converter.getStore() );
	dataElement.attributes.originalIndex = index;

	return dataElement;
};

ve.dm.MWExtensionNode.static.toDomElements = function ( dataElement, doc, converter ) {
	var el, els,
		index = converter.getStore().indexOfHash( OO.getHash( [ this.getHashObject( dataElement ), undefined ] ) ),
		originalMw = dataElement.attributes.originalMw;

	// If the transclusion is unchanged just send back the
	// original DOM elements so selser can skip over it
	if (
		index === dataElement.attributes.originalIndex ||
		( originalMw && ve.compare( dataElement.attributes.mw, JSON.parse( originalMw ) ) )
	) {
		// The object in the store is also used for CE rendering so return a copy
		els = ve.copyDomElements( dataElement.originalDomElements, doc );
	} else {
		if ( converter.isForClipboard() && index !== null ) {
			// For the clipboard use the current DOM contents so the user has something
			// meaningful to paste into external applications
			els = ve.copyDomElements( converter.getStore().value( index ), doc );
		} else {
			el = doc.createElement( this.tagName );
			el.setAttribute( 'typeof', 'mw:Extension/' + this.getExtensionName( dataElement ) );
			el.setAttribute( 'data-mw', JSON.stringify( dataElement.attributes.mw ) );
			els = [ el ];
		}
	}
	if ( converter.isForClipboard() ) {
		// Resolve image sources
		$( els ).find( 'img' ).addBack( 'img' ).each( function () {
			var $this = $( this );
			$this.attr( 'src', ve.resolveUrl( $this.attr( 'src' ), doc ) );
		} );
	}
	return els;
};

ve.dm.MWExtensionNode.static.getHashObject = function ( dataElement ) {
	return {
		type: dataElement.type,
		mw: dataElement.attributes.mw
	};
};

/**
 * Get the extension's name
 *
 * Static version for toDomElements
 *
 * @static
 * @param {Object} dataElement Data element
 * @return {string} Extension name
 */
ve.dm.MWExtensionNode.static.getExtensionName = function () {
	return this.extensionName;
};

/* Methods */

/**
 * Get the extension's name
 *
 * @method
 * @return {string} Extension name
 */
ve.dm.MWExtensionNode.prototype.getExtensionName = function () {
	return this.constructor.static.getExtensionName( this.element );
};

/**
 * DataModel MediaWiki inline extension node.
 *
 * @class
 * @abstract
 * @extends ve.dm.MWExtensionNode
 *
 * @constructor
 * @param {Object} [element] Reference to element in linear model
 */
ve.dm.MWInlineExtensionNode = function VeDmMWInlineExtensionNode() {
	// Parent constructor
	ve.dm.MWInlineExtensionNode.super.apply( this, arguments );
};

/* Inheritance */

OO.inheritClass( ve.dm.MWInlineExtensionNode, ve.dm.MWExtensionNode );

/* Static members */

ve.dm.MWInlineExtensionNode.static.isContent = true;

/**
 * DataModel MediaWiki block extension node.
 *
 * @class
 * @abstract
 * @extends ve.dm.MWExtensionNode
 *
 * @constructor
 * @param {Object} [element] Reference to element in linear model
 * @param {ve.dm.Node[]} [children]
 */
ve.dm.MWBlockExtensionNode = function VeDmMWBlockExtensionNode() {
	// Parent constructor
	ve.dm.MWBlockExtensionNode.super.apply( this, arguments );
};

/* Inheritance */

OO.inheritClass( ve.dm.MWBlockExtensionNode, ve.dm.MWExtensionNode );